<!DOCTYPE html>
<html lang="en">
	<head>
		   
		<meta charset="UTF-8">
		   
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		   
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		    <title>Document</title>
		    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js"></script>
		   
		<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css">
		    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
		    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"></script>
	</head>
	<body class="container">
		    <h3 class="mb-4">额外附加内容</h3>
		    <div class="alert alert-warning" role="alert">
			        <h4>第一题：一个正方形，宽6米，高8米，下面正确的选项为()。</h4>
			       
			<hr>
			        <p>A.周长为28米</p>
			        <p>B。面积为28平方米</p>
			   
		</div>
	</body>
</html>
